Mars scientists have discovered the first evidence of ancient lakes (Figure).

<P> <CENTER> </ CENTER> <P> </ P> <P align=center> Lake Mars simulation diagram </ P> <P> Beijing June 18, according to foreign media reports, the University of Colorado .Boulder research group, has been found on Mars the red planet can prove the existence of shoreline with a decisive first-hand evidence. .This finding indicates that ancient lakes on Mars, but also indicates that we might be on the red planet in the past can be found there signs of life. .</ P> <P> University of Colorado at Boulder research associate and leader of the study 盖塔诺迪亚 Craig (Gaetano Di Achille) said, estimated that the lake may have been 30 billion years old, .It covers an area of 80 square miles and 1,500 feet deep, almost on the border between the United States and Canada, as large as Lake Xiapu Lun. .They found a broad delta of the shore line of evidence, including a series of ditches and canals criss-crossing, scientists think there may still some remnants of the beach sediments. .Diaz Clay said: "This is to prove existence of the Martian surface the first shoreline conclusive evidence. On the shore line and the identification of geological evidence, help us to calculate the size and volume of the lake. The lake is clearly .In the formation of about 34 million years ago. "</ P> <P> Concordia Craig, University of Colorado at Boulder Associate Professor Brian Enhai Nick (Brian Hynek) and Research Assistant Mien Di Hills ( .Mindi Searls) in the atmosphere and space physics with laboratory work, they write a paper in this regard has been published in the American Geophysical Union's publications - online, "Geophysical Research Letters" on. .Picture used in this study is from "high-resolution imaging science experiment" (High Resolution Imaging Science Experiment) camera shot. ."High-resolution imaging science experiment," the camera aboard NASA's Mars Reconnaissance Orbiter (MRO), from 200 miles away from the orbit of Mars can be clearly photographed on the red planet size is 1 meter surface characteristics of objects. .</ P> <P> University of Colorado at Boulder associate professor of geological Heinicke said that the "high-resolution imaging science experiment," the camera captured an image analysis showed that the water washed the Martian surface, a long .30 miles of the valley, this valley and a valley connected to water to form a large delta sediments. .The delta and around the basin suggests that before there was a big lake here. .The lake bed in a larger valley, known as the 沙尔巴塔纳 (Shalbatana) Valley. .He said: "For us, found on the shoreline on Mars is a major gain." </ P> <P> Heinicke said another of the evidence that the lake is widely believed in the cold on Mars .drought there. .This argument with many planetary scientists proposed the theory is not consistent with the current. ."This discovery not only proved the existence of Mars has a long-term lake system, but also to show a picture of another - when warm, humid period on Mars, after the Department of the lake still exists." </ P> <P> .Planetary scientists believe the surface of Mars, the oldest is about 4.1 to 3.7 billion years ago, warm and humid Nuoya Kan (Noachan) formed during the above there are many large meteorite collided with it leaving a huge crater and the water system .. .According to the study, said scientists believe the newly discovered lake is in the Western discipline (Hesperian epoch), or 300 million years ago, at the end of warm, wet season form. .</ P> <P> According to Heinicke said planetary scientist delta near the lake, very interested, because the delta on the planet will soon be the organic carbon and other life marker (Biomarker) buried together. .Most biologists believe that celestial bodies, they form only by underground microorganisms can be found signs of life existing on Mars. .But in the past the lake surface of Mars may be rich in nutrients for microbial surface provides a comfortable habitat. .</ P> <P> Concordia Craig said that the lake disappeared very fast, no time to lower the formation of the coastline. .According to the study, the lake is not to be quickly evaporated, is to be frozen, the water slowly into the water vapor in the climate changed dramatically when the lake disappeared. .Concordia Craig, recently found the original lake bed and delta sediments, will be the future look for signs of life on Mars landing mission main object of study. .He said: "Delta and lakes on the planet good 'collection' and preserved evidence of past life. If life once existed on Mars, then the delta may be the biology of Mars reveal the key to the past. ."</ P> </ p>.